docs: def getOverlayRenderModel(self, ulOverlayHandle, pchValue, unBufferSize):
          """Gets render model to draw behind this overlay"""
  
          fn = self.function_table.getOverlayRenderModel
          pColor = HmdColor_t()
          pError = EVROverlayError()
          result = fn(ulOverlayHandle, pchValue, unBufferSize, byref(pColor), byref(pError))
          return result, pColor, pError